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[media] media: adv7180: add power pin control 

Some targets control the ADV7180 power pin via a gpio, so add
optional support for "powerdown" pin control.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Tested-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Steve Longerbeam 2016-07-19 21:03:32 -03:00 committed by Mauro Carvalho Chehab
parent ce5d6290df
commit 65d9e14a65
3 changed files with 33 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/devicetree/bindings/media/i2c/adv7180.txt
View File

@ -15,6 +15,11 @@ Required Properties :
"adi,adv7282"
"adi,adv7282-m"
Optional Properties :
- powerdown-gpios: reference to the GPIO connected to the powerdown pin,
if any.
Example:
i2c0@1c22000 {

2
drivers/media/i2c/Kconfig
View File

@ -187,7 +187,7 @@ comment "Video decoders"
config VIDEO_ADV7180
tristate "Analog Devices ADV7180 decoder"
depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API
depends on GPIOLIB && VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API
---help---
Support for the Analog Devices ADV7180 video decoder.

27
drivers/media/i2c/adv7180.c
View File

@ -26,6 +26,7 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio/consumer.h>
#include <linux/videodev2.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
@ -213,6 +214,7 @@ struct adv7180_state {
struct media_pad pad;
struct mutex mutex; /* mutual excl. when accessing chip */
int irq;
struct gpio_desc *pwdn_gpio;
v4l2_std_id curr_norm;
bool powered;
bool streaming;
@ -463,6 +465,19 @@ static int adv7180_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm)
return 0;
}
static void adv7180_set_power_pin(struct adv7180_state *state, bool on)
{
if (!state->pwdn_gpio)
return;
if (on) {
gpiod_set_value_cansleep(state->pwdn_gpio, 0);
usleep_range(5000, 10000);
} else {
gpiod_set_value_cansleep(state->pwdn_gpio, 1);
}
}
static int adv7180_set_power(struct adv7180_state *state, bool on)
{
u8 val;
@ -1210,6 +1225,8 @@ static int init_device(struct adv7180_state *state)
mutex_lock(&state->mutex);
adv7180_set_power_pin(state, true);
adv7180_write(state, ADV7180_REG_PWR_MAN, ADV7180_PWR_MAN_RES);
usleep_range(5000, 10000);
@ -1279,6 +1296,14 @@ static int adv7180_probe(struct i2c_client *client,
state->field = V4L2_FIELD_INTERLACED;
state->chip_info = (struct adv7180_chip_info *)id->driver_data;
state->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(state->pwdn_gpio)) {
ret = PTR_ERR(state->pwdn_gpio);
v4l_err(client, "request for power pin failed: %d\n", ret);
return ret;
}
if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {
state->csi_client = i2c_new_dummy(client->adapter,
ADV7180_DEFAULT_CSI_I2C_ADDR);
@ -1370,6 +1395,8 @@ static int adv7180_remove(struct i2c_client *client)
if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2)
i2c_unregister_device(state->csi_client);
adv7180_set_power_pin(state, false);
mutex_destroy(&state->mutex);
return 0;